Add system API to install ephemeral apps

Test: manual; install using "adb install --ephemeral"
Change-Id: Idce214779fea5f3c4a0121542319044f9f0e0a42

api/system-current.txt

@@ -10236,6 +10236,7 @@ package android.content.pm {
     method public void setAppPackageName(java.lang.String);
     method public void setDontKillApp(boolean);
     method public void setGrantedRuntimePermissions(java.lang.String[]);
+    method public void setInstallAsInstantApp(boolean);
     method public void setInstallLocation(int);
     method public void setOriginatingUid(int);
     method public void setOriginatingUri(android.net.Uri);

cmds/pm/src/com/android/commands/pm/Pm.java

@@ -553,7 +553,7 @@ public final class Pm {
                     sessionParams.abiOverride = checkAbiArgument(nextOptionData());
                     break;
                 case "--ephemeral":
-                    sessionParams.installFlags |= PackageManager.INSTALL_EPHEMERAL;
+                    sessionParams.setInstallAsInstantApp(true /*isInstantApp*/);
                     break;
                 case "--user":
                     params.userId = UserHandle.parseUserArg(nextOptionData());

core/java/android/content/pm/PackageInstaller.java

@@ -1066,6 +1066,16 @@ public class PackageInstaller {
             }
         }
 
+        /** {@hide} */
+        @SystemApi
+        public void setInstallAsInstantApp(boolean isInstantApp) {
+            if (isInstantApp) {
+                installFlags |= PackageManager.INSTALL_EPHEMERAL;
+            } else {
+                installFlags &= ~PackageManager.INSTALL_EPHEMERAL;
+            }
+        }
+
         /** {@hide} */
         public void dump(IndentingPrintWriter pw) {
             pw.printPair("mode", mode);

services/core/java/com/android/server/pm/PackageManagerShellCommand.java

@@ -1109,7 +1109,7 @@ class PackageManagerShellCommand extends ShellCommand {
                     sessionParams.abiOverride = checkAbiArgument(getNextArg());
                     break;
                 case "--ephemeral":
-                    sessionParams.installFlags |= PackageManager.INSTALL_EPHEMERAL;
+                    sessionParams.setInstallAsInstantApp(true /*isInstantApp*/);
                     break;
                 case "--user":
                     params.userId = UserHandle.parseUserArg(getNextArgRequired());